function genPassword($length = 8) {
$validCharacters = "abcdefghijklmnopqrstuxyvwzABCDEFGHIJKLMNOPQRSTUXYVWZ1234567890";
$validCharNumber = strlen($validCharacters);
$result = "";
for ($i = 0; $i < $length; $i++) {
$index = mt_rand(0, $validCharNumber - 1);
$result .= $validCharacters[$index];
}
return $result;
}